function getDataTxt (){
  watermark({ watermark_txt:'tett', watermark_rows:12,watermark_cols:'red'})
}

function watermark(settings) {
  //默认设置
  var defaultSettings = {
      watermark_txt: "text",
      watermark_x: 20, //水印起始位置x轴坐标
      watermark_y: 20, //水印起始位置Y轴坐标
      watermark_rows: 5, //水印行数
      watermark_cols: 2, //水印列数
      watermark_x_space: 40, //水印x轴间隔
      watermark_y_space: 50, //水印y轴间隔
      watermark_color: '#aaa', //水印字体颜色
      watermark_alpha: 0.4, //水印透明度
      watermark_fontsize: '15px', //水印字体大小
      watermark_font: '微软雅黑', //水印字体
      watermark_width: 140, //水印宽度
      watermark_height: 80, //水印长度
      watermark_angle: 15 //水印倾斜度数
  };
  //采用配置项替换默认值，作用类似jquery.extend
  if(arguments.length === 1 && typeof arguments[0] === "object") {
      var src = arguments[0] || {};
      for(key in src) {
          if(src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
              continue;
          else if(src[key])
              defaultSettings[key] = src[key];
      }
  }

  var oTemp = document.createDocumentFragment();

  //获取页面最大宽度
  var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
  var cutWidth = page_width * 0.0150;
  var page_width = page_width - cutWidth;
  //获取页面最大高度
  var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450;
  // var page_height = document.body.scrollHeight+document.body.scrollTop;
  //如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
  if(defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width * defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {
      defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
      defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
  }
  //如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
  if(defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {
      defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
      defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
  }
  var x;
  var y;
  for(var i = 0; i < defaultSettings.watermark_rows; i++) {
      y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
      for(var j = 0; j < defaultSettings.watermark_cols; j++) {
          x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;

          var mask_div = document.createElement('div');
          mask_div.id = 'mask_div' + i + j;
          mask_div.className = 'mask_div';
          mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
          //设置水印div倾斜显示
          mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
          mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
          mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
          mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
          mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
          mask_div.style.visibility = "";
          mask_div.style.position = "absolute";
          mask_div.style.left = x + 'px';
          mask_div.style.top = y + 'px';
         mask_div.style.overflow = "hidden";
          mask_div.style.zIndex = "9999";
          mask_div.style.pointerEvents = 'none'; //pointer-events:none  让水印不遮挡页面的点击事件
          //mask_div.style.border="solid #eee 1px";
          mask_div.style.opacity = defaultSettings.watermark_alpha;
          mask_div.style.fontSize = defaultSettings.watermark_fontsize;
          mask_div.style.fontFamily = defaultSettings.watermark_font;
          mask_div.style.color = defaultSettings.watermark_color;
          mask_div.style.textAlign = "center";
          mask_div.style.width = defaultSettings.watermark_width + 'px';
          mask_div.style.height = defaultSettings.watermark_height + 'px';
          mask_div.style.display = "block";
          oTemp.appendChild(mask_div);
      };
  };
  document.body.appendChild(oTemp);
}